Recording and/or reproducing methods and apparatuses
In one embodiment the method includes reading speed information from a specific area of the recording medium. The speed information includes one or more speed flags to indicate whether a corresponding speed is applicable to the recording medium. A first speed flag for a first recording speed lower than a second recording speed is set to be dependent on a second speed flag for the second recording speed. Data is recorded on a main data area of the optical recording medium based on the read speed information.
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This is a continuation application of application Ser. No. 10/885,087 filed Jul. 7, 2004, the entire contents of which are hereby incorporated by reference.
FOREIGN PRIORITY INFORMATIONThis application claims the benefit of Korean Applications No. 10-2003-0056540 filed on Aug. 14, 2003, No. 10-2003-0063591 filed on Sep. 15, 2003, and No. 10-2003-0065628 filed on Sep. 22, 2003, which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to a method of recording a control information on recording medium, such as a recordable optical disc having at least one recording layer, and more particularly, to a method in which writing speed information and write strategy parameters are included in the disc control information. Also, this invention relates to a method of recording or reproducing data on or from the recording medium using the writing speed information
2. Discussion of the Related Art
A high density optical recording medium, known as HD-DVD, is widely used to record and store high-definition video data, large amount program data, and high-quality audio data and so on. The Blu-ray disc represents next-generation HD-DVD technology.
Technological specifications are now being established for the global standardization of the Blu-ray disc, including standards are for the write-once Blu-ray disc (BD-WO). Meanwhile, a rewritable Blu-ray disc, known as the 1×-speed BD-RE and now being discussed, should be compatible with BD-RE discs expected to have higher writing speeds, i.e., the 2×-speed BD-RE and beyond. BD-WO specifications for high writing speed are also in progress. Efficient solutions for coping with the high writing speed of a high-density optical disc are urgently needed, and the specifications established should ensure mutual compatibility.
SUMMARY OF THE INVENTIONThe present invention relates to a method of recording data on a recording medium.
In one embodiment the method includes reading speed information from a specific area of the recording medium. The speed information includes one or more speed flags to indicate whether a corresponding speed is applicable to the recording medium. A first speed flag for a first recording speed lower than a second recording speed is set to be dependent on a second speed flag for the second recording speed. Data is recorded on a main data area of the optical recording medium based on the read speed information.
The present invention further relates to an apparatus for recording data on a recording medium.
In one embodiment, the apparatus includes a pickup unit for reading speed information from a specific area of the recording medium. The speed information includes one or more speed flags to indicate whether a corresponding speed is applicable to the recording medium. A first speed flag for a first recording speed lower than a second recording speed is set to be dependent on a second speed flag for the second recording speed. The apparatus further includes a controller for controlling the recording of data on a main data area of the recording medium based on the read speed information.
The present invention still further relates to a method for recording data on a recording medium having one or more recording layer.
One embodiment of the method includes reading control information written within a management area of the recording medium per recording speed. The control information includes one or more recording speeds and write strategy information depending on each of the recording speeds. The recording speed applicable to the corresponding recording layer is determined by referring to the control information, and data is recorded on the corresponding recording layer based on the write strategy information depending on the determined recording speed.
The present invention still further relates to an apparatus for recording data on a recording medium having one or more recording layers.
In one embodiment, the apparatus includes controller for determining recording speed applicable to the corresponding recording layer by referring to control information written on a management area of the recording medium. The control information includes one or more recording speeds and write strategy information depending on each of the recording speeds. The apparatus also includes a pickup unit for recording data on the corresponding recording layer based on the write strategy information depending on the determined recording speed.
In another embodiment, the apparatus includes a pickup unit for reading control information from a management area of the optical disc and reading/writing data from/on the optical disc. The control information includes one or more applicable recording speeds, and one or more and write strategy information depending on each of the applicable recording speeds, The control information further includes one or more recording speed flags respectively indicating the recording speeds are applicable to each of the recording layers. A controller is configured to determine the recording speed applicable to the corresponding recording layer by referring to control information written on a management area of the recording medium and allowing the pickup unit to record data on the corresponding recording layer based on the write strategy information depending on the determined recording speed.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
A Blu-ray disc is taken as an example of an optical disc according to the present invention. Yet, the concept of the present invention, characterized in an optical disc having its disc control information recorded thereon, is applicable to DVD-RAM, DVD-RW, DVD+RW, DVD-R, DVD+R, and similar such discs.
Although the terminology used herein is well known for the most part, some terms have been chosen by the applicant, such that the present invention should be understood with the intended meanings of the terminology as used by the applicant. For example, the “disc control information” of a disc is recorded in a specified area, i.e., a recordable area of the disc or a prerecorded area (sometimes known as an embossed area, in which manufacturer data is recorded and where no further recording is possible), and includes information necessary for the playback of a recorded disc. Disc control information is called “disc information” or “DI” in relation to Blu-ray disc technology but is typically referred to as “physical format information” for DVD-RAM, DVD-RW, DVD+RW, DVD-R, and DVD+R discs. Hence, it should be apparent that the technical background of the present invention is equally applicable to physical format information.
Moreover, the disc information according to the present invention is recorded as an unspecified unit of information, which may be counted, for example, as a first or second information.
Referring to
The present invention intends to provide a method of recording disc information (DI) as disc control information required for recording and/or reproducing of a disc in a pre-recorded or recordable are. It is apparent that a recording method in the pre-record area is differently applied to each kind of disc. In the case of BD-RE and BD-WO discs, the pre-recorded area is the PIC area recorded using a bi-phased high-frequency modulated signal reproduced according to a specific playback method, to acquire the disc information.
Information representing the corresponding recording layer, information representing recording velocity, and write strategy information corresponding to the recording velocity are included in each disc information. Such information is utilized in recording and reproducing the optical disc, to provide optimal recording power per recording layer and per recording velocity.
The disc information of the present invention is characterized in providing specific recording velocity information supported by the disc and associated write strategy information, and more specifically, in providing specific recording velocity supported for each recording layer and associated write strategy information via a specified method for discs having a plurality of recording layers.
The specific configuration of the disc information is for a Blu-ray disc, which may differ from the configuration of a DVD-based disc. Specifically, the recording DI volume for a Blu-ray disc is 112 bytes or equivalent. By configuring the disc information of the same recording layer as one information, i.e., without repeating any common information, the write strategy configuration may differ per recording velocity.
To acquire disc information associated with a specific writing speed of an intended specific recording layer from a plurality of existing disc information, all the disc information should be read, which is time consuming. For instance, if there are four recording layers and eight writing speeds applicable per recording layer, a total of 32 disc information are needed. A recorder/reproducer (
Moreover, one write strategy (WS) is recorded within each disc information and identification information for identifying a kind of the corresponding write strategy (WS) is separately recorded, whereby a record playback apparatus (
Referring to
Writing speed information applicable by a corresponding disc is recorded in a specific area (Nth byte) within disc information which is named ‘Writing speed flag’ field. For instance, whether a specific writing speed of eight kinds of writing speeds is applicable by the corresponding disc is represented by 1-bit each in the same area having 1-byte allocated thereto. Namely, it can be defined that the corresponding writing speed is not applicable (supported) if a bit value is ‘0b’ in entire bits or that the corresponding writing speed is applicable (supported) if the bit value is ‘1b’. Hence, each of the bits b0˜b7 within 1-byte becomes flag information indicating applicability of a specific writing speed.
For instance, if 1× speed is applicable by a corresponding disc only, ‘0000 0001’ is written in Nth byte. If all of the eight kinds of writing speeds are applicable, ‘1111 1111’ is written in the Nth byte.
In the above explanation, 1× and 2× speeds utilized by every disc almost are previously decided to be adopted. Yet, writing speeds decided by specification can be used as the remaining writing speeds from 3rd writing speed. For instance, the 3rd, 4th, 5th, 6th, 7th, and 8th writing speeds may be set to 5×, 6×, 8×, 12×, 14×, and 16× speeds, respectively.
According to the present invention, an allowable writing speed is represented by a bit having a value of “1,” and each bit having a value of “0” represents an excluded writing speed. Hence, there can be no case of a lower bit being set to zero while an upper bit is set to one. For example, a disc allowing writing speeds up to the fourth writing speed has writing speed flag of 0000 1111b, and a writing speed flag of, say, 0000 1011b, is barred.
For another example, bits can be independently set. Even if upper bits are set to ‘1b’, it is able to set lower bits to ‘0b’. In case that a lower writing speed has to be applicable if a maximum writing speed is applicable, write parameters according to the corresponding writing speed should be written altogether. Hence, it may become a considerable load put on an information recording. By rendering a portion of the lower writing speed inapplicable even if the maximum writing speed is applicable, it is able to reduce the corresponding information amount. Furthermore, be using one specific writing parameter, at least two recording speeds can be possible.
Meanwhile, recording layer information indicating the number of recording layer(s) existing within the corresponding disc is recorded in another specific area (Lth byte) within the disc information, which is named ‘Number of Recording Layer’ field. For instance, a value meaning the number of the recording layer(s) can be represented by a binary number in the same area having 1-byte allocated thereto. In case that the recording layer is the single layer in
Since limitation is put on the number of the currently considered recording layer(s), which is currently two recording layers, 4-bits within the Lth byte are enough to represent total fifteen recording layers (in case of ‘1111’). In such a case, it is apparent that other valid information can be written in the remaining area (4-bits) of the Lth byte.
Moreover, identification information for identifying a kind of write strategy (WS) recorded in Pth˜111th bytes is written in another specific area (Mth byte) within the disc information, which is named ‘Write Strategy (WS) Type’ field.
Namely, in the disc information of the present invention, one write strategy (WS) is recorded for a specific writing speed and a specific recording layer and the write strategy is optionally selected from various kinds of specified types by a disc manufacturer. Hence, if the corresponding disc information is a first type write strategy WS-1, ‘0000 0001’ is written in the Mth byte. If the corresponding disc information is a second type write strategy WS-2, ‘0000 0010’ is written in the Mth byte. Substantial write strategy (WS) is recorded in Pth˜111th bytes. Yet, the substantial write strategy (WS) will be recoded as a value interoperating with the decided write strategy (WS) type in the Mth byte. The write strategy (WS) type via the Mth byte is optionally recordable in every disc information. It is also possible to apply one specified write strategy (WS) type in basic speed (1× speed) disc information, which is expected to be supported by every record playback apparatus (
In addition to a method of recording specific parameters of the write strategy (WS), a medium property of a recording layer is generally modified by applying a laser beam to the recording layer within an optical disc via a pickup (‘11’ in
The write strategy (WS) can be recorded in various ways. As a disc becomes highly densified and has higher speed, a writing speed, i.e., disc RPM) as well as the medium property of the recording layer is considerably affected. Hence, a more accurate system is requested. The various write strategies (WS) are explained as follows for example.
First of all, there is a system having a recording pulse smaller by 1 than a recording mark size (n) formed on a recording layer medium, which may be called ‘(n−1) WS’. Secondly, there is a system having a recording pulse having a size amounting to a half of the recording mark size (n), which may be called ‘n/2 WS’. New write strategies (WS) keep being developed. Regarding the different kinds of write strategy (WS), when there exist the various systems of the write strategy (WS) exist as parameters applied to the write strategies (WS) differ from each other, a disc manufacturer tests the recording power according to the write strategy (WS) to be recorded in the selected Mth byte and then records a result of the test as write strategy (WS) in the Pth˜111th bytes within the disc information.
From the above-recorded ‘writing speed information’ of the Nth byte and the ‘recording layer information’ of the Lth byte, the record/playback apparatus (
The above-decided information about the number of total disc information can be recorded in a specific area (e.g., 4th byte or the like) (not shown in the drawing) within the disc information as well.
Hence, it is able to program a plurality of the above-decided disc information that the sequence is decided by the sequence numbers, which is written in the 5th byte in the foregoing description, and that each of the disc information designates the previously decided writing speed and recording layer by the sequence.
For example, by knowing that four writing speeds applicable by a disc exist if the Nth byte is ‘0000 1111’ and that two recording layers exist within the disc if the Lth byte is ‘0000 0010’, total eight disc information are needed so that the sequence will be ‘00h˜07h’. It is previously decided that disc information of ‘00h’, ‘01h’, ‘02h’, ‘03h’, ‘04h’, ‘05h’, ‘06h’, and ‘07h’ relate to ‘1× speed, 1st recording layer (L0)’, ‘2× speed, 2nd recording layer (L1)’, ‘2× speed, 1st recording layer (L0)’, ‘2× speed, 2nd recording layer (L1)’, ‘3rd writing speed, 1st recording layer (L0)’, ‘3rd writing speed, 2nd recording layer (L1)’, ‘4th writing speed, 2nd recording layer (L1)’, and ‘4th writing speed, 2nd recording layer (L1)’, respectively.
In the above-explained example, the writing speed is preferentially taken into consideration. Yet, it is apparent that the recording layer can be preferentially taken into consideration. Namely, it can be defined in the sequence of ‘1st recording layer (L0), 1× speed’, ‘1st recording layer (L0), 2× speed’, and the like
Hence, in order to acquire the disc information for a specific target writing speed and a specific target recording layer, the record playback apparatus (
Hence, in the example of
An intrinsic write strategy (WS) is recorded in other bytes within each disc information as well as Nth and Lth bytes. Specifically, information of a type of a write strategy (WS) written in Pth˜111th bytes within the corresponding disc information is recorded in Mth byte. Namely, information in the Mth byte can be different from that in the Pth˜111th bytes.
In the example in
An intrinsic write strategy (WS) is recorded in other bytes within each disc information as well as Nth and Lth bytes. Specifically, information of a type of a write strategy (WS) written in Pth˜111th bytes within the corresponding disc information is recorded in Mth byte. Namely, information in the Mth byte can be different from that in the Pth˜111th bytes.
In the another example of
Likewise, if intending to search disc information related to 16×-speed of a fourth recording layer to perform recording by applying a write strategy (WS) within the corresponding disc information, the record playback unit (
Therefore, if a host or a control unit (‘20’ in
Namely, in the same manner of the first embodiment of the present invention in
In the second embodiment (
For instance, in order for the upper 4-bits b0˜b3 of the 7th byte to represent maximum 16× speed, it is defined that ‘0000b’, ‘0001b’, and ‘1111b’ mean 1×-speed, 2×-speed, and 16×-speed, respectively. The lower 4-bits of the 7th byte is rendered to directly display a value of the recording layer. It is defined that ‘0000b’, ‘0001b’, and ‘1111b’ mean 1st recording layer L0, 2nd recording layer L1, and 16th recording layer L15, respectively.
Hence, if the corresponding disc information is the 2×-speed associated information of the second recording layer, the 7th byte becomes ‘0001(L1) 0001(2×)’.
Hence, the 2×-speed associated disc information of the 1st recording layer enables to inform that the disc information of ‘04h’ corresponds to |it| using the Nth and Lth bytes like the example of
Specifically, a third embodiment according to the present invention is characterized in that, in recording various kinds of write strategies (WS) within disc information, the write strategy (WS) kinds amounting to a per writing speed specific number (e.g., m, where m<n) among the various kinds (e.g., n-kinds) of the write strategies (WS) specified for disc manufacturer's (or disc information writer's) convenience are optionally recordable only and that, for convenience of a manufacturer developing an optical record playback apparatus (
A method of recording disc information according to a third embodiment of the present invention is explained by referring to
Referring to
Writing speed information applicable by a corresponding disc is recorded in a specific area (Nth byte) within disc information, which is named ‘Writing speed flag’ field. For instance, whether a specific writing speed of eight kinds of writing speeds is applicable by the corresponding disc is represented by 1-bit each in the same area having 1-byte allocated thereto. Namely, it can be defined that the corresponding writing speed is not applicable (supported) if a bit value is ‘0b’ in entire bits or that the corresponding writing speed is applicable (supported) if the bit value is ‘1b’. Hence, each of the bits b0˜b7 within 1-byte becomes flag information indicating applicability of a specific writing speed. For instance, if 1× speed is applicable by a corresponding disc only, ‘0000 0001b’ is written in Nth byte. If all of the eight kinds of writing speeds are applicable, ‘1111 1111b’ is written in the Nth byte.
In the above explanation, 1× speed (1×) and 2× speed (2×) utilized by every disc almost are previously decided to be adopted. Yet, writing speeds decided by specification can be used as the rest writing speeds from 3rd writing speed. For instance, it is possible to set 3rd, 4th, 5th, 6th, 7th, and 8th writing speeds (3rd×, 4th×, 5th×, 6th×, 7th×, 8th×) to 5×, 6×, 8×, 12×, 14×, and 16× speeds, respectively.
And, information of informing a kind of write strategy (WS) applicable by a specification of a corresponding disc is recorded in another specific area (Lth byte) within the disc information, which is named ‘Write Strategy (WS) flag’ field. For instance, whether a specific write strategy (WS) of eight kinds of write strategies (WS) is applicable by the corresponding disc is represented by 1-bit each in the same area having 1-byte allocated thereto.
Namely, it can be defined that the corresponding write strategy (WS) is not applicable (supported) if a bit value, is ‘0b’ in entire bits or that the corresponding write strategy (WS) is applicable (supported) if the bit value is ‘1b’. Hence, each of the bits b0˜b7 within 1-byte becomes flag information indicating applicability of a specific write strategy (WS). For instance, if 1st to 3rd type write strategies (WS1 to WS3) are applicable by a corresponding disc only, ‘0000 0001b’ is written in Lth byte. If all of the eight types of write strategies (WS1 to WS8) are applicable, ‘1111 1111b’ is written in the Lth byte.
In doing so, a setup state of lower bits is not decided according to a setup state of upper bits. Instead, the lower bits are independently set, respectively. For instance, if the 1st and 3rd type write strategies WS1 and WS3 are applicable but the 2nd type write strategy WS2 is inapplicable, the Lth byte will be set to ‘0000 0101b’.
Meanwhile, recording layer information indicating the number of recording layer(s) existing within the corresponding disc is recorded in another specific area (Mth byte) within the disc information, which is named ‘Number of Recording Layer’ field. For instance, a value meaning the number of the recording layer(s) can be represented by a binary number in the same area having 1-byte allocated thereto. In case that the recording layer is the single layer (one recoding layer) in
And, parameters of a selected write strategy (WS) are written in another specific area (Pth˜111th bytes) within the disc information, which is named ‘Write Strategy (WS) parameters’ field.
By writing the Nth, Lth, and Mth byte information recorded within the disc information by the same values in common to the entire disc information, respectively, the record playback apparatus (
Hence, it may be able to record disc information per writing speed, per recording layer, and per write strategy (WS) type. Yet, in such a case, the number of the recorded disc information excessively increases. Moreover, a disc manufacturer should test the entire write strategy (WS) types and record the test results within the disc information, whereby it becomes a burden.
Therefore, in the third embodiment according to the present invention, write strategies (WS) of which number (m) is smaller than that (n) of the maximum applicable write strategy types are recordable within disc information and a disc manufacturer further enables to optionally record a specific one of a plurality of write strategies (WS), whereby disc manufacturer's convenience is secured as well as an efficient recording of disc information is enabled.
Namely, it is able to record disc information using write strategy (WS) types (kinds) of which number (two) is smaller than that (four) of the entire applicable write strategy (WS) types (kinds).
Specifically, regardless of the number of the applicable write strategy (WS) types, a disc manufacturer preferably selects two of the applicable write strategy (WS) types to perform recording per writing speed. Thus, a degree of freedom of optional recording is secured for the disc manufacturer as well as the number of disc information recorded within a disc can be appropriately adjusted.
Specifically, in
Namely, in case of recording two kinds of write strategy (WS) types per writing speed, 1st type write strategy WS1 is preferentially recorded in a mandatory manner in case of 1× speed (1×) and one of 2nd to 4th type write strategies WS2 to WS4 is optionally selected to be recorded. In
Moreover, in 2× speed (2×) or 3rd writing speed (3rd×), without the above-explained limitation, two of the four kinds of write strategies WS1 to WS4 are selected to be recorded.
The specific write strategy (WS) is recorded for the 1× speed in a mandatory manner. This is to enable a manufacturer or developer of a record playback apparatus (
Hence, the writing speed allocating the write strategy (WS) in a mandatory manner can be set to such a higher speed as 2× speed and the like instead of 1× speed in specific specifications. And, it is apparent that the technical idea of the present invention is simply extended to such an application according to the technological development.
Namely, by recording the information indicating the optimal write strategy (WS), a record playback apparatus (
Referring to
Namely, bits within the Qth byte indicates write strategy (WS) types in one-to-one correspondence, respectively to mean total eight kinds of the write strategy (WS) types. Specifically, ‘b0’, ‘b1’, and ‘b7’ mean 1st, 2nd, and 8th type write strategies @S1, @s2, and WS 8, respectively. If a bit value in the entire bits is ‘1b’, the write strategy (WS) of the corresponding type becomes the optimal write strategy (WS) type within the corresponding writing speed.
Namely, one of eight bits within the Qth byte becomes ‘1b’ only, while each of the rest bits will be ‘0b’.
Referring to
For example,
Moreover, in order to enable a record playback apparatus (
Hence, each of the Qth bytes within ‘04h˜07h’ as the disc information related to the 2× speed will be set to the same ‘0000 0010b’ and each of the Qth bytes within ‘08h˜11h’ as the disc information related to the 4× speed will be set to the same ‘0000 0100b’.
Moreover, Pth˜111th bytes within the disc information are areas for recording the write strategy (WS) meant by the corresponding disc information. Hence, the write strategy (WS) will be recorded in each of the corresponding disc information. In
In summary of the example of
Referring to
The control unit 20 gives a recording or playback command for a specific area, and the record/playback unit 10 caries out the recording/playback for the specific area according to the command of the control unit 20. Specifically, the record/playback unit 10 may include an interface unit 12 performing communications with the host, or an external device, a pickup unit 11 directly recording data on the optical disc or playing back the data, a data processor 13 receiving a playback signal from the pickup unit 11 to restore into a necessary signal value or modulating to deliver a signal to be recorded into a signal to be recorded on the optical disc, a servo unit 14 reading out a signal from the optical disc correctly or controlling the pickup unit 11 to record a signal on the optical disc correctly, a memory 15 temporarily storing disc control information including disc control information, and a microcomputer 16 responsible for controlling the above-described elements within the record playback unit 10. In the above system, it is also possible to control the recording and/or reproducing of data without the control unit 20. In that case, the Microcomputer 16 may control all units in the record/playback unit 10 as performing the function of the control unit 10.
A recording process of an optical disc according to the present invention is explained in detail as follows.
First of all, once an optical disc is loaded in the optical recording and reproducing apparatus, the entire disc management information within the disc is read out to be temporarily stored in the memory 15 of the record/playback unit 10. And, various kinds of the disc management information are utilized for the record/playback of the optical disc. Specifically, the management information stored in the memory 15 includes disc information of the present invention. Hence, the recording layer information, writing speed information, and write strategy applicable to the corresponding writing speed recorded within the disc information are read out to be stored in the memory.
For instance, an applicable writing speed and write strategy of the loaded disc are determined based on the flag information indicating applicability of a specific writing speed and write strategy information indicating a usable write strategy type and its parameters included in the management information.
If intending to perform a writing on a specific area within the optical disc, the control unit 20 renders such an intent into a writing command and then delivers it to the record/playback unit 10 together with data for writing location information to be recorded. After receiving the writing command, the microcomputer 16 decides the corresponding writing speed applied to an intended recording layer within the optical disc from the management information stored in the memory 15 and then performs the writing command using the optimal write strategy by referring to the decided writing speed.
Accordingly, the present invention provides various methods of providing disc control information coping with higher writing speed in a high-density optical disc, thereby enabling to uniformly apply the standardized disc control information to efficiently cope with the record/playback of the optical disc.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention.
Claims
1. A method of recording data on a optical recording medium, comprising:
- reading speed information including one or more speed flags to indicate whether a corresponding speed is applicable to the recording medium or not and wherein a first speed flag for a first recording speed higher than a second recording speed is set to be dependent on a second speed flag for the second recording speed; and
- recording data on a main data area of the optical recording medium based on the read speed information.
2. The method of claim 1, wherein the first speed flag is set to indicate that the first recording speed is applicable or that the first recording speed is inapplicable when the second speed flag indicates that the second recording speed is applicable, while the first speed flag is set to indicate only that the first recording speed is inapplicable when the second speed flag indicates that the second recording speed is inapplicable.
3. The method of claim 2, wherein the recording the data comprises recording the data according to the first recording speed indicated by the first speed flag or according to the second recording speed indicated by the second speed flag.
4. The method of claim 3, wherein the recording the data comprises recording the data according to higher recording speed among the first and second recording speeds indicated by the first and second speed flags.
5. The method of claim 3, further comprising:
- reading write strategy information including write strategy parameters for a specific recording speed, wherein the write strategy parameters is used when recording the data on the main data area at the specific recording speed.
6. The method of claim 5, wherein the recording the data comprises recording the data on the main data area of a specific recording layer.
7. The method of claim 5, wherein the recording the data comprises recording the data on the main data area by using an optimum write strategy type for the first recording speed or the second recording speed.
8. An apparatus for recording data on a recording medium, comprising:
- an optical pickup configured to read or record data on or from the recording medium;
- a servo, operatively coupled to the optical pickup, configured to control a servo operation of the optical pickup according to a specific recording speed;
- a memory, configured to store speed information, including one or more speed flags to indicate whether a corresponding speed is applicable to the recording medium or not and wherein a first speed flag for a first recording speed higher than a second recording speed is set to be dependent on a second speed flag for the second recording speed; and
- a controller operatively coupled to the optical pickup, servo and memory, the controller configured to identify the speed information stored in the memory and control the optical pickup to record data on a main data area of the recording medium based on the identified speed information.
9. The apparatus of claim 8, wherein the first speed flag is set to indicate that the first recording speed is applicable or that the first recording speed is inapplicable when the second speed flag indicates that the second recording speed is applicable, while the first speed flag is set to indicate only that the first recording speed is inapplicable when the second speed flag indicates that the second recording speed is inapplicable.
10. The apparatus of claim 9, wherein the controller is further configured to control the optical pickup to record the data according to the first recording speed indicated by the first speed flag or according to the second recording speed indicated by the second speed flag.
11. The apparatus of claim 10, wherein the controller is configured to control the optical pickup to record the data according to higher recording speed among the first and second recording speeds indicated by the first and second speed flags.
12. The apparatus of claim 10, wherein the optical pickup is further configured to read write strategy information including write strategy parameters for a specific recording speed, wherein the controller is further configured to control the optical pickup to record the data using the write strategy parameters at the specific recording speed.
13. The apparatus of claim 12, wherein the controller is configured to control the optical pickup to record the data on the main data area based on the identified speed information and write strategy information.
14. The apparatus of claim 12, wherein the controller is configured to control the optical pickup to record the data on the main data area by using an optimum write strategy type for the first recording speed or the second recording speed.
15. A method for recording data on a recording medium having one or more recording layers, comprising:
- reading control information written within a management area of the recording medium, wherein the control information includes one or more recording speed and write strategy information depending on the corresponding recording speed;
- determining a recording speed applicable to the corresponding recording layer by referring to the control information; and
- recording data on the corresponding recording layer based on the write strategy information depending on the determined recording speed.
16. The method of claim 15, wherein the control information further includes one or more recording speed flags indicating respectively whether the recording speeds are applicable to each of the recording layers.
17. The method of claim 15, the determining the recording speed comprises determining the highest recording speed among the recording speeds applicable to the corresponding recording layer.
18. The method of claim 15, wherein the recording the data comprises recording the data on the corresponding recording layer according to optimum write strategy parameters of the write strategy information.
19. An apparatus for recording data on a recording medium having one or more recording layers, comprising:
- a memory to store control information including one or more recording speeds and write strategy information for a corresponding recording speed;
- a controller, operatively coupled to the memory, configured to determine a recording speed applicable to a corresponding recording layer by referring to the control information stored in the memory;
- a pickup unit, operatively coupled to the controller, configured to record data on the corresponding recording layer under control by the controller based on the write strategy information depending on the determined recording speed.
20. The apparatus of claim 19, wherein the control information further includes one or more recording speed flags indicating respectively whether the recording speeds are applicable to the corresponding recording layers and the controller is further configured to determine the recording speed applicable to the corresponding recording layer based on the recording speed flags included in the control information.
21. The apparatus of claim 19, wherein the controller is configured to determine the highest recording speed among the recording speeds applicable to the corresponding recording layer.
22. The apparatus of claim 19, wherein the pickup unit is configured to record the data on the corresponding recording layer under control by the controller according to optimum write strategy parameters of the write strategy information.
23. An apparatus for recording data on an optical disc, comprising:
- an optical pickup unit configured to read or write data from or on the optical disc;
- a servo, operatively coupled to the optical pickup, configured to control a servo operation of the optical pickup according to a recording speed;
- a memory configured to store control information including one or more recording speeds, one or more write strategy information usable at the recording speed and recording speed flags respectively indicating whether a recording speed is applicable to the optical disc, wherein the recording speed flags includes at least a first speed flag for higher recording speed and a second speed flag for lower recording speed, the first speed flag depending on the second speed flag; and
- a controller operatively coupled to the optical pickup, servo and memory, the controller configured to identify a recording speed applicable to the optical disc by referring to the control information stored in the memory and control the optical pickup to record data on the optical disc using the write strategy information usable at the applicable recording speed.
24. The apparatus of claim 23, wherein the first speed flag is set in connection with the second speed flag in a manner that the first speed flag is set to indicate that the higher recording speed is applicable or that the higher recording speed is inapplicable when the second speed flag indicates that the lower recording speed is applicable, while the first speed flag is set to indicate only that the higher recording speed is inapplicable when the second speed flag indicates that the lower recording speed is inapplicable, wherein the controller is further configured to control the optical pickup to record the data according to the higher recording speed indicated by the first speed flag or according to the lower recording speed indicated by the second speed flag.
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Type: Grant
Filed: Mar 7, 2007
Date of Patent: Jun 2, 2009
Patent Publication Number: 20070153652
Assignee: LG Electronics Inc. (Seoul)
Inventors: Jin Yong Kim (Seongnam-si), Sang Woon Suh (Seoul)
Primary Examiner: Muhammad N. Edun
Attorney: Harness, Dickey & Pierce, P.L.C.
Application Number: 11/714,877
International Classification: G11B 5/09 (20060101); G11B 7/24 (20060101);